My Asterisk 1.2.40 process crashes regularly in the is_zero_or_null function at: return (*vp->u.s == 0 || (to_integer (vp) && vp->u.i == 0)); My gdb trace is at: http://pastebin.com/raw.php?i=hmhzZxye Other examples here: http://lists.digium.com/pipermail/asterisk-users/2010-March/245927.html Can anyone please help?